class AC:
    def cold_wind(self):
        pass

    def hot_wind(self):
        pass

    def swing_wind(self):
        pass


class Gree(AC):
    def cold_wind(self):
        print("格力冷风")

    def hot_wind(self):
        print("格力热风")

    def swing_wind(self):
        print("格力摇摆风")


class Midea(AC):
    def cold_wind(self):
        print("美的冷风")

    def hot_wind(self):
        print("美的热风")

    def swing_wind(self):
        print("美的摇摆风")


if __name__ == '__main__':
    gree = Gree()
    gree.cold_wind()
    gree.hot_wind()
    gree.swing_wind()

    midea = Midea()
    midea.cold_wind()
    midea.hot_wind()
    midea.swing_wind()
